Of the things on that list, I find the road flares sometimes difficult to find. There are different types available, but the ones I prefer are the CIL Safety Flares that are red tubes (which look like sticks of dynamite) that you pop the cap off and strike like a giant match. They burn in almost any weather condition and last for about 20 minutes (at least the ones I have). Because they’re not battery-powered, you don’t have to worry about the batteries not working in the cold or changing the batteries periodically. In the last couple of years, I’ve only been able to find them consistently at Home Hardware (click the link to take you to the product page). Acklands Grainger also has various road flare kits for reasonable prices.

If you’re going to be doing any driving this winter, you should seriously consider putting together a survival kit because you never know when you might need it.